Trying to help out a friend.
NSS/MW car,10.70s 4.10gear. 493in wedge
Last year it would occasionally gain RPM about the 1,000ft mark.
Jump from 6,200 to nearly 7,000...car would slow 5 to 8 hundredths.
Had trans gone thru by a GOOD trans guy and fellow MW racer.
Only thing he found was some slippage on 3rd clutch.
Refreshed and back in.
Got worse.
Ordered a new converter 9.5".
Car picked up 60ft....but now gains RPM even more frequently.
Pulled the trans again...teardown...no damage or evidence whatsoever.
Is totally unpredictable, but he says it seems more frequent as it gains temperature...so installed bigger cooler and a gauge.
Never gets past 170.
I thought it sounded like it is not keeping the converter full..IE. emptying the pan.
Been through all the usual things..fuel pressure/volume ..ignition...shifter.
Ideas???